Re: Multi-site replication speed

Brian Topping <brian.topping@xxxxxxxxx> · Mon, 15 Apr 2019 23:57:36 -0600

On Apr 15, 2019, at 5:18 PM, Brian Topping <brian.topping@xxxxxxxxx> wrote:

If I am correct, how do I trigger the full sync?

Apologies for the noise on this thread. I came to discover the `radosgw-admin [meta]data sync init` command. That’s gotten me with something that looked like this for several hours:

[root@master ~]# radosgw-admin  sync status
          realm 54bb8477-f221-429a-bbf0-76678c767b5f (example)
      zonegroup 8e33f5e9-02c8-4ab8-a0ab-c6a37c2bcf07 (us)
           zone b6e32bc8-f07e-4971-b825-299b5181a5f0 (secondary)
  metadata sync preparing for full sync
                full sync: 64/64 shards
                full sync: 0 entries to sync
                incremental sync: 0/64 shards
                metadata is behind on 64 shards
                behind shards: [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63]
      data sync source: 35835cb0-4639-43f4-81fd-624d40c7dd6f (master)
                        preparing for full sync
                        full sync: 1/128 shards
                        full sync: 0 buckets to sync
                        incremental sync: 127/128 shards
                        data is behind on 1 shards
                        behind shards: [0]

I also had the data sync showing a list of “behind shards”, but both of them sat in “preparing for full sync” for several hours, so I tried `radosgw-admin [meta]data sync run`. My sense is that was a bad idea, but neither of the commands seem to be documented and the thread I found them on indicated they wouldn’t damage the source data. 

QUESTIONS at this point:

1) What is the best sequence of commands to properly start the sync? Does init just set things up and do nothing until a run is started?
2) Are there commands I should run before that to clear out any previous bad runs?

Thanks very kindly for any assistance. As I didn’t really see any documentation outside of setting up the realms/zones/groups, it seems like this would be useful information for others that follow.

best, Brian
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